Britannia, 45 AD: Vespasian's brother, Sabinus, is captured by druids. The druids want to offer a potent sacrifice to their gods – not just one Roman Legate, but two. They know that Vespasian will come after his brother and they plan to sacrifice the siblings on midsummer's day. Vespasian must strive to save his brother whilst completing the conquest of the south-west of the haunted isle, before he is drawn inexorably back to Rome and the heart of Imperial politics. As Messalina's time as Empress comes to a bloody end, Claudius' three freedmen each back a different mistress. But which woman will be victorious? And at what price for Vespasian?